What will hold startup founders together through those ‘sense of impending doom’ moments? The fact that the business idea is great? Y Combinator’s Paul Graham thinks not: the relationship between founders has to be more important than the venture.

I just read this question on Quora: ‘What good books tell the story of the business model iterations and pivots of a notable company?’ My response is not a book, but a video of a talk at Y Combinator Startup School